Furnace construction



5 Sheets-Sheet 1 A TTORNE Y F. H. WAITE ET AL.

FURNACE CONSTRUCTION Filed' oct. 15, 1925 Nov. l, 1927.

BY ZM a, dan@ 5 Sheets-Sheet 2 INVENTORS B'y @4m m Frank HW ce EEmQEWDc/wy F. H. WAITE ET AL l FURNACE CONSTRUCTION Filed Ot. l5, 1925 .M @N .2 5 1 N a 1 1:1. mm 9T m MW 2 WW om v Q 2 Q h i i 1 ufff m mm WWI, e l f I m f h N. Irl( l,

Nov. 1, 1927.

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A TTORNE Y Nov. l, 1927.

. F. H. WAITE ET A1.

FURNACE CONSTRUCTI 0N Filed oct. 15, 1925 5 Sheets-Sheet 3 IN VEN TOR` Max. s

A TTURNE Y Nov. .1, 1927. 1,647,488

F. l-l. WAlTE ET AL FURNAGE CONSTRUCTION Filed oct. 15. 1925 `5 sheets-sheet 4 INVENTORS A TTORNE Y Nov.'l, 1927.

F. H. WAITE ET AL FURNACE CONSTRUCTION 5 Sheets-Sheet. 5

Filed Oct. 15,1925

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A TTORNE Y Patent Nov. 192?.

FRANK H. WAITE AND GEORGE W. DAVEY, 0F LONG ISLAND CITY, YORK.

FURNACE CONSTRUCTION.

Application led October 15, 1925. Y Serial No. 62,630.

Our invention relates to furnace construction and the method of circulating air in furnace walls wherein air is circulated throughout thek walls, preheated'in transit and is directed either into the combustion chamber or throat ofthe furnace or both.

rlhis is accomplished by utilizing the heat transfer function of our air cooled furnace blocks specifically illustrated, described and claimed in our application bearing Serial Number 55,752, tiled September 11th, 1925.

Our invention not oniy contemplates the furnace construction but also the combinations of air circulations by forced draft from a blower or fan or the like and more specifically relates to the utilizing of preheated air thus obtained for a more perfect combustion of the fuel in the furnace and is particularly useful in connection with water tube boiler stoker furnaces.

One object of our invention is to circulate air within furnace walls in such a manner that the air is forced under pressure of a blower or fan throughout the walls of a furnace, flows in .the same direction or at right angles to the flaming gases within the combustion chamber and the preheated air is utilized for a more complete combustion of the fuel.

Another object of our invention is to circulate air within furnace walls under pressure of a blower or fan as aforesaid yand to circulate air by natural or stack draft in the arch, utilizing the preheated air in both circulations for a more complete combustion of the fuel.

Other valuable features of our invention are' described, pointed out and illustrated in the accom anym drawings wherein Jlike numerals re erto li e parts, in which Figure 1 is a longitudinal section of a water tube boiler stocker furnacey with a sus'- pended air cooled arch.

' Figure 2 is a plan in section of a part of Figure 1.

Figure 3 is a longitudinal section of a water tube boiler stoker furnace with a suspended arch, illustrating a modification of the invention.

Figure 4 is a partial plan in section of Figure 3.

vFigure 5 fp a longitudinal section of a water tube boiler stoker furnace, illustrating another modication.'

Figure 6 is a partial plan in section of Figure 5.

lFigure 7 is a longitudinal section of a water tube boiler stoker furnace with a suspended arch, illustrating still another modication of the invention.

Figure 8 is a partial elevation in section of Figure 7. y

Figure 9 is a plan view illustrating an expansion block employed.

Figure 10 is a partial plan view in section of Figure 7.

Figures 1 and 2 illustrate a water tube boiler stoker furnace comprising a front wall 1, side walls 2 and 3, bridge wall 4, arch 5, water tubes 6, drum 7, diagonal baille 8, vertical balie 9, gas outlet 10, clean out opening 11, combustion chamber 12, throat 13, Stoker 14, coal hopper 15, Stoker gratel, and a blower or fan 17 driven by the motor 19 and belt 18.

There are two separate and distinct circulations of air in the wallsI and arch as well as the well known forced draft circulation throughout the furnace from blower to stack, illustrated` in Figures 1 and 2, one of which circulates' under pressure throughout the side walls 2 and .3 having for its specific purpose the object of cooling the blocks and directing the lair preheated in transit throughout the said blocks. into a common manifold, together with the other circulation which passes throughout the suspendedv blocks of the arch by natural draft intol said manifold, both `circulations being delivered into .the throat of the furnace to complete the combustion of the fuel therein.

The side walls 2 and 3 arey built up'of ,a

series of superimposed,horizontal courses of air cooled blocks 22, having horizontal passa es 23 and verticalpassages 24 therein, and said wall being provlded with the horizon# tal expansion space 30 and also expansion blocks 25 and 2 6, illustratedi Figure9, integral with the wall built up of unit blocks '22, the expansion blocks 25 and 26, Vhaving i expansion spaces 27 and 28 preferably lled with asbestos or the like upon its` constructionl or some lireproo'f compressible or some incombustible material. f

To provide forthe vertical expansion the wall has expansion spaces 29 preferablyfilled with somey combustible material during the process of building or a compressible incombustible material equal or equivalent t0 asbestos.

The expansion blocks 25 and l26 are slida'ble at31 in gas-tight unity with each other and arebuilt up in a wall together with unit blocks 22 hereinbefore mentioned, all of which having the functions illustrated, .described and claimed in our pending applications led September 11th, 1925, bearing Serial Number 55,752 and October 8th, 1925,

' 9 around the water tubes6,upwardly around saidtubes' around the dru1n7, out the gas outlet 10 to the stack or the like.

The air cooling the side walls is lforced by the blower 17 into a wind box or an equivalent 20, 'through a conduit, pipe elbow or the like 21 which is provided with a controlling damper 32, through a flue,duct or the like 33l and communicating wlth a common duct 34 and 34a, one on each wall 2 and 3, integral with the. wall ofa superimposed blocks 22, 25.v

and 26, shown in Figure 1, said duct l34communicating with the Vvertical and vh irizontall 4passages 23 andf24'within the blocks 22, 25

an'd 26, passes upwardly, rparallel to the iow of flaming gases wit in the combustion chamber' of the furnace, throughout each wall 2 and 3 into the common manifold 35 througha duct or equivalent 36 and 36, one for each side wall, through a multiplicityfof iues, ducts or the like 37 into the throat of the furnace, where the air preheated in transit throughout the walls is utilized for a more perfect combustion of the products offcombustion therein."

The other f circulation'by natural draft entering the flues 39 of the arch through a series of openings, ducts or the like 42, said arch being composed of a series 'of unit blocks 38, formed or moulded to provide upon the completion ofthe arch the series 0 iues lor ducts 39throughout and integral with the arch y5, said lues directing the air t6 pass throughout the arch in a direction at right angles to the iiow of iaming gases within the' combustion chamber12, into a common manifold 40 from whence :the air vpreheated in transit fthroughout the arch 5 1s directed into Pthe common manifold 35 by the ue or duct 41 where it mingles with the stack draft throughout the arch is controlledy byltheslide 46 of the damper 47 as illustrated inFigure 2.

Figures 3 and 4 illustrate a furnace construction and method of circulating four different and separate circulations of air therein.,

The first circulation is typical throughout the --specication Aand drawings and lcomprises the well known forced draft circulation from the blower' or fan 17 wherein the air is forced into the wind box 2O through va duct, elbow or pipe 21 provided with a controlling damper 32, under the grate 1'6 of thestoker 14, throughout the, fuel bed on the said wgrate into the combustion chamber 12, upwardly through the throat 13, around the Water tubes 16under and around the drum 7 over the angular baffle 8, downwardly around the water tubes 6,y under the vertical baflieA 9, upwardly around said tubes 6, around the drum 7 and through 'the gas outlet 1G vto the stack.

The second and third forced draft, circulations are in side wallsv 2 andv 3, respectively, wherein some of the air from the blower or fan 17, forced into the wind box 20 "passing through, the pipe or the likel 21 with the' controlling damper 32 under the grate 16 of the Stoker 14, passes upwardly through the duct or lines 33 and 60 into a commonmanifold 34 and 34a from whence it passes upwardly throughout the wall built up of superim# posed, broken jointed' unit aircooled refractory blocks 22, 25 and 26, within the horizontal and vertical passages, iiues or the like 23 and 24, integral with said blocks 22, 25 and 26, through the ducts, iiues -or openings 48' and 48a into the combustion chamber 12 at'a point adjacent to the throat 13 on a plane parallel, below or near to the combustion arch ofthe furnace, whereby the air preheated in transit directed upwardly parallel to the flow of flaming gases within the combustion chamber throughout the said blocks 1s utilized for a more complete combustion of the products of combustion within the furnace.

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The fourth circulation is a natural orV stack draft/circulation wherein the air passes mtothe'ues or ducts 39 forme upon the completion ofthe arch 5, throng the ducts,

ue or opening 42 provided with controlling dam' er 47 with the slide 46, flows in an upwar direction substantially parallel to the flow of flaming gases within the combustion chamber 12, into a common manifold 40, passes through a flue or duct 41 into a common manifold 45 from whence Vit enters the 'throat 13 of the furnace through a multiplicity of iues or ducts 37.

This arch is composed of a series of unit blocks 38 detachably held in suspension by suitable means, one of which is illustrated in Figures 3 and 4 wherein the blocks 38, with their iues 39 therein are suspended bythe I beam 49, clamps 50, rods 51, rods 43, beams 44 and nuts 45, or any suitable equivalent.

The side walls 2 andv3are provided with means to compensate forY the horizontal expansion of 'the walls, which means is similar to that utilized in Figures 1 and 3 as illus.

trated in Figure 9 in conjunction with the expansion space 30; and the vertical expansion is compensated for by the expansion space 29 as4 clearly shown in Figure 3.

Figures 5 and 6 illustrate/a water tube boiler stoker furnace wherein there are three separate and distinct circulations utilized.

The first circulation comprises the well known forced' draft circulation as hereinbefore mentioned.

The second circulation is in the side wall 3, wherein part of the air from the fan or -blower 17, passing into the wind boxy 20 through the' elbow 21 with the controlling damper 32 under 'the Stoker grate 16 enters the flue or duct 33 and 56, passes into the common manifold 34 from whence itI iows in a substantially horizontal direct/ion at right angles to the flow of flaming gases within-the combustion chamber 12, throughout the air cooled blocks 22, 25 and 26, which makes-up a portion. ofthe wall,3, into a common manifold 58 which is connected to another manifold 54, located in wall by a fiue or duct 59, lsaid manifold 54 being provided with a. multiplicity of flues or ducts 55 com'- municating with the interior of the furnace into the combustion chamber .12.

' The lthird circulation is similar 'tothe second aforesaid only in the opposite wall 2 wherein the air from the blower or fan 17 enters the windV box 20, the elbow 21 with the controlling damper 32, under the grate 16 of the stoker 14 and partof which is' forced by pressure into the ducts or iues land 57, passes into the common manifold 61 throughoutthe air cooled refractory blocks 22, 25 and 26 into the common manifold 62 from whence it passes into the manifold 52 through-the fine or duct 58 .z-'ch manifold 52 is provided with a multiplicity of iiues or ducts 53, communicating with the combus- 'tion chamber 12 of the furnace.

The walls are provided with special expansion blocks 25 and 26 hereinbefore mentioned and described and vertical expansion means 29.

Figures 7 and 8 illustrate a water tube boiler stoker furnace having an arch wherein there are four separate and distinct circulations part of the preheated air being `directed under the combustion arch 5A and part into the throat of the furnace.

The first circulation comprises the well'v known forced draft circulation as hereinbefore mentioned.

The second circulation is in the side wall.l

make up a portion of the wall 3, into a common manifold 58 which is connected to another manifold 54 by a fiue or duct 59, located in wall 1, said manifold being providedl with a multiplicityy of fines or ducts 55 connecting with the interior of the furnace or combustion chamber 12, under arch 5.

IThe third circulation is similar to the second yaforesaid only inthe opposite wall 2 wherein the air .from the blower 17 enters the Wind box 20, the elbow 21 with the damper 32 under the Stoker grate 16of the Stoker 14 -and part of which is forced by pressure into the duct or fiue 60 and 57, passes into the common-manifold 62from whence it passes into the manifold 52 through the iues or ducts 53 into .the combustion chamber 12 of the furnace directly under the combustion arch 5.

The Walls are provided with special expansion blocks 25 and 26 hereinbefore mentioned andi described and the' vertical expansion means 29.

` The fourth circulation is a natural or stack draft wherein the air passes into the flues or ducts 39 formed upon the com letion of the arch 5 through ducts, or ues or openings provided wit-hcontrolling dampers 47 with slides 46, fiows at right angles across and throughout the arch orin a direction at right angles to the fiow of flamL .ing gases inthe combustion chamber 12, into a common manifold 40, passes through a flue or duct 41 into a common manifold 35, from whence 1t enters the throat 13 of the subject matter pertaining to the s eciic con;` struction and circulations in com ination as modifications may be made without departing from the spirit of the invention or scope of the, claims.

We claim 1. In' a. furnace construction having channelled Irefractory walls around the `combusvtion chamber, a stoker gra/te, an air :feeder .therebelow, and an outlet in anupper part of the'chamber for the products of combustion; the combination of an arch having air passages therein, air inlets to said passages,

` means adjacent the furnace outlet whereby air may be drawnthereinto through the inlets and passages `under the iniiuence"- of the urnace draft, air conductingmeans com 'municating with the wall channels and with the space beneath the grate whereby part of the air from the feeder is forced into and through said channels, and air delivery means communicating with said channels' lets and passages under the inuence of the furnace draft, air conducting means com Larmes through said channels, and air delivery' means communicating with Asaid channels Ainto 'an upperpart of the furnace, together with valve means controlling the ,air circulated through said walls and said arch.

'3. In a furnace yconstruction having 'chanf nelled refractory walls around the combustion chamber, a Stoker grate, an air feeder therebelow, and an outletin an upper part of the chamber for the products of combustion; the combination of lan arch having air passages therein, air inlets to said passages, meansy adjacent the furnace outlet whereby airmay be drawn thereinto through the inlets and passages under the inuence o f the furnace draft, air conducting means communicating with the wall channels and with the space beneath the grate whereby part of the air from the feeder is forced into and through said channels, and air delivery 

